Imagine giving birth to a baby girl via cesarean section at 37 weeks and then that baby having her own cesarean section within 24 hours because she was born with a baby inside of her. It sounds like something from a science fiction movie, but that's exactly what happened in Barranquilla, Colombia, to Mónica Vega. It turns out that her baby girl, Itzmara, was seemingly "pregnant" with her own twin due to a rare condition called fetus in fetu.
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Fetus in fetu happens when there are twins and the embryo does not divide correctly. Normally, in the case of twins, the division happens during the first week of gestation. Siamese twins occur when the division takes place during the second week. Fetus in fetu occurs when the division happens after 17 days and one twin is encapsulated in the body of the other, thus becoming a "parasitic" twin. This very rare condition happens once in every one million pregnancies and usually isn't discovered until after the mother has given birth, but that was not the case this time around.